The N999 Tortue, the world's largest natural gas floating production storage and offloading vessel, sets sail at the Qidong COSCO marine engineering wharf on Jan 7. [Photo/Nantong Daily]

The N999 Tortue, the world's largest natural gas floating production storage and offloading vessel, set sail at the Qidong COSCO marine engineering wharf on Jan 7 for trial operation.

The vessel was ordered by BP p.l.c.

It is 270 meters long, 54 meters wide and 31.5 meters deep. It is the size of two football fields and the height of a 10-story building. It has a maximum displacement of about 320,000 metric tons and a storage capacity of at least 1.44 million barrels of oil.

The vessel's living area is about 22 meters long, 41 meters wide and 32 meters high, and can accommodate 140 people.

It has a gas processing capacity of 500 million standard cubic feet per day at full capacity.